ST72C334N2T6 STMicroelectronics, ST72C334N2T6 Datasheet - Page 40

• Manufacturer Part Number: ST72C334N2T6
• Description: Microcontrollers (MCU) Flash 8K SPI/SCI
• Manufacturer: STMicroelectronics

Specifications of ST72C334N2T6

• Data Bus Width: 8 bit
• Program Memory Type: Flash
• Program Memory Size: 8 KB
• Data Ram Size: 384 B
• Interface Type: SCI, SPI
• Maximum Clock Frequency: 8 MHz
• Number Of Programmable I/os: 32
• Number Of Timers: 16 bit
• Operating Supply Voltage: 3.2 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: TQFP-64
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 8 bit
• Lead Free Status / Rohs Status: In Transition

ST72334J/N, ST72314J/N, ST72124J
POWER SAVING MODES (Cont’d)
5.2.3 WAIT Mode
WAIT mode places the MCU in a low power con-
sumption mode by stopping the CPU.
This power saving mode is selected by calling the
“WFI” ST7 software instruction.
All peripherals remain active. During WAIT mode,
the I bit of the CC register is forced to 0 to enable
all interrupts. All other registers and memory re-
main unchanged. The MCU remains in WAIT
Figure 30. WAIT mode flow-chart
40/125
N
Note:
WFI INSTRUCTION
INTERRUPT
** Before servicing an interrupt, the CC register is pushed on the stack.
* The peripheral clock is stopped only when exit caused by RESET and not by an interrupt.
Y
OSCILLATOR
PERIPHERALS
CPU
N
OSCILLATOR
PERIPHERA LS
CPU
I BIT
RESET
Y
OFF*
OFF
ON
mode until an interrupt or Reset occurs, whereup-
on the Program Counter branches to the starting
address of the interrupt or Reset service routine.
The MCU will remain in WAIT mode until a Reset
or an Interrupt occurs, causing it to wake up.
Refer to Figure 30.
OFF
ON
ON
0
if exit caused by a RESET, a 4096 CPU
clock cycle delay is inserted.
OSCILLATOR
PERIPHERALS
CPU
OR SERVICE INTER RUPT**
FETCH RESET VECTOR
ON
ON
ON